package com.t18;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;

/**
 * Created by xuyiwei on 2018/8/27.
 */
public class DirList {
    public static void main(String[] args) {
         File path = new File(".");
         String[] list;
         if(args.length==0){
             list = path.list();
         }else{
             list = path.list(new DirFilter(args[0]));
         }
         Arrays.sort(list,String.CASE_INSENSITIVE_ORDER);
         for(String dirItem:list){
             System.out.println(dirItem);
         }
    }
}
class DirFilter implements FilenameFilter{
    private Pattern pattern;
    public DirFilter(String regex){
        pattern = Pattern.compile(regex);
    }
    @Override
    public boolean accept(File dir, String name) {
        return pattern.matcher(name).matches();
    }
}
